2 ms·

He wrote a thesis on decision theory.

• the_af 5y ago
  He wrote a thesis in the sense of he actually wrote a thesis for a known university, that is referenced and quoted in academia by decision theory scholars, or do you mean he self-published a "thesis" in the sense he wrote something that nobody in the field pays much attention to and that cannot be published in peer reviewed journals? If the latter, anybody can do that.